NATO is not a loaf of rising bread that expands on its own when left on a windowsill. My country is in NATO because I voted for successive governments that set it as their top priority, because I believed then and I believe now that tight cooperation with likeminded countries is the best way to deter another Russian invasion (we've had 40+ of them in recorded history).
And this is the universal view in Europe as of 2024. No country in Europe can afford on their own what Ukraine has been through, and this makes military alliances essential for national security. Even Sweden with its 200+ years of neutrality ditched it as soon as Russia invaded Ukraine. Ukraine is by now a cautionary tale of naive belief in diplomacy (Helsinki Accords; Budapest memorandum; etc) without a big stick to back it up.
Conspiracy theories about the US turning Europe against Russia are completely redundant. When it comes to national security, no responsible government in parts of Europe closest to Russia can afford to stay out of NATO. If you were the prime minister of Finland, why would you not do everything you could to join NATO and enter the mutual defense pact seeing how Russia behaves in Ukraine?
For a very long time, both Finland and Sweden had a deep belief that skillful diplomacy could prevent a war with Russia, but what do you do when Russia starts blasting that your country doesn't exist?